# <span lang="EN-US

Proof

Let ABC be a triangle,

Now, < + ___________________ (i) < + ___________________ (ii) < + ___________________ (iii) 2 < + + [From equation (i)] 2 < 180° [Sum of angles of triangle]  < 90° ________________ (a)

Similarly,  < 90°__________________ (b)  < 90°__________________ (c)

From equation (a), (b) and (c), each angle is less than 90°

Therefore triangle is an acute angled Proved.

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